package com.huyirong.aicode.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.huyirong.aicode.exception.BusinessException;
import com.huyirong.aicode.exception.ErrorCode;
import com.huyirong.aicode.model.dto.UserQueryRequest;
import com.huyirong.aicode.model.enums.UserRoleEnum;
import com.huyirong.aicode.model.vo.LoginUserVo;
import com.huyirong.aicode.model.vo.UserVo;
import com.mybatisflex.core.query.QueryWrapper;
import com.mybatisflex.spring.service.impl.ServiceImpl;
import com.huyirong.aicode.model.entity.User;
import com.huyirong.aicode.mapper.UserMapper;
import com.huyirong.aicode.service.UserService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;
import static com.huyirong.aicode.constant.UserConstant.USER_LOGIN_STATE;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 用户 服务层实现。
 *
 * @author 小组成员:胡意蓉、徐紫旎、郭秀丽、顾雨寒、段正阳
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>  implements UserService{

    @Override
    public long useRegister(String userAccount, String userPassword, String checkPassword) {
        //1、校验参数(hutool工具)
        if(StrUtil.hasBlank(userAccount,userPassword,checkPassword)){
            //如果参数为空，报参数异常
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        //校验账号长度
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号长度过短");
        }
        //校验密码长度
        if(userPassword.length()<6 || userPassword.length()>12){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码长度不正确");
        }
        //确认密码
        if(!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入密码不一致");
        }

        //2、查询用户是存在
        //查询这个账号对应的相同账号有几个
        QueryWrapper queryWrapper = new QueryWrapper();//mybatis-flx中的自定义查询器
        queryWrapper.eq("userAccount", userAccount);
        long count = this.mapper.selectCountByQuery(queryWrapper);
        if(count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        //3、加密密码
        String encryptPassword = getEncryptPassword(userPassword);

        //4、创建用户、插入数据库
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if(!saveResult){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"注册失败，数据库异常");
        }
        return user.getId();//注册成功，返回用户ID，主键回传
    }

    @Override
    public LoginUserVo getLoginUserVo(User user) {
        if(user == null){
            return null;
        }
        LoginUserVo loginUserVo = new LoginUserVo();
        BeanUtil.copyProperties(user,loginUserVo);
        return loginUserVo;
    }

    @Override
    public UserVo getUserVo(User user) {
        if(user == null){
            return null;
        }
        UserVo userVo = new UserVo();
        BeanUtil.copyProperties(user,userVo);
        return userVo;
    }

    @Override
    public List<UserVo> getUserVoList(List<User> userList) {
        //hutool工具集合判空
        if(CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVo)
                .collect(Collectors.toList());
    }

    //加密函数
    @Override
    public String getEncryptPassword(String userPassword){
        //盐值混淆密码
        //定义盐值
        final String SALT = "karry";
        return DigestUtils.md5DigestAsHex((userPassword + SALT).getBytes(StandardCharsets.UTF_8));
    }

    @Override
    public LoginUserVo userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1、校验参数
        if(StrUtil.hasBlank(userAccount,userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号长度过短");
        }
        if(userPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码长度过短");
        }

        //2、加密
        String encryptPassword = getEncryptPassword(userPassword);
        //3、查询用户是否存在
        QueryWrapper queryWrapper = new QueryWrapper();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.mapper.selectOneByQuery(queryWrapper);
        if(user == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        //4、如果用户存在，记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        //5、返回脱敏后的用户信息
        return this.getLoginUserVo(user);
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        //1、判断用户是否登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if(currentUser == null || currentUser.getId() == null ){
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        //2、从数据库查当前用户信息
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if(currentUser == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        return currentUser;
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        //1、判断用户是否登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if(currentUser == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户未登录");
        }
        //移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        return QueryWrapper.create()
                .eq("id", id)
                .eq("userRole", userRole)
                .like("userAccount", userAccount)
                .like("userName", userName)
                .like("userProfile", userProfile)
                .orderBy(sortField, "ascend".equals(sortOrder));
    }

}
